SymLab and its add-ons combine to form an easy-to-use Computer-Aided Engineering (CAE) software system that can help you assess the performance of your 3D model.
Using SymLab add-ons you can create any 2D or 3D geometry or import your geometry from another CAD package. Then simulate how a gas (e.g. air) or liquid (e.g. water) will flow over and through your geometry.

SymLab is simple to learn and efficient to use. You can study how the physics of your model changes over time or as you modify your model in real time. SymLab's unified simulation environment makes it easy to change your model on the fly and quickly see the results of your changes.

Examples of models you can analyze with SymLab:

Airflow over an aircraft wing
Water flow around a submarine
Airflow over a moving car

To realize SymLab's full geometry creation and simulation capabilities, i.e., to generate sym files for your own designs, you will need to expand the free download with one or more of the following add-ons:

Builder: create and modify your own 2D and 3D geometry designs
Panel Flow: simulate gas (e.g. air) or liquid (e.g. water) flow around and through your design to determine flow directions and forces
Transient: explore time-dependent simulations and visualization of results
Exchange: import and export IGES, STEP and faceted file formats
Viz Export: export your 3D results to high resolution, high quality renderers and other visualization packages
Professional: obtain all of the above functionality in a single discounted package

The license of this software is Freeware, you can free download and free use this 3d graphic software.